Transformer cut-out



Aug. 13, 1935. E. M. MEYER TRANSFORMER CUT-OUT Filed Nov. 10, 1931 3SheetsSheet l Aug. 13,1935. 5 MEYER 2,011,543

TRANSFORMER CUT OUT '1 Aug. 13, 1935. MEYER 2,011,543

TRANSFORMER CUT -OUT Filed Nov. 10, 19 31 3 Sheets-Sheet 3 WMWWWMIPatented Aug. 13, 1935 UNITED STATES PATENT OFFICE Porce ain Mud-smvmel' 10, i931, Sella] No. 574,193

12 Claims.

This invention relates to novel improvements in -rmor cut-outs generallyand especially to those in which a tusible cut-out is replaceablymounted in an insulating housing. Devices ot fliis type are intended toprovide mountings U. lot' thelusecartridge shall berelatively uniform.

in oflserwords, -it is desirableto avoid the possibility of a.iaultyoonneotion-tothecircuit where dude is applied, otherwise there islikelihood or daughter b down of resistance, arcing & at pitting,accompanied by static disturbances which cause Anterierenoe withtheexisting radiomnt-waves in thesther.

011001 ohe objectsof my invention is to provide-a Iuse oartlzidge-of theusual-cylindrical type all mithextonded motes permitting a maximumwith'the' termmalsot-the line conductors. A furflier-objectof myinvention is to improve the design-oi the terminals'of the lineconductor rhy'pmviding-themdnthe iorm oi clips which shall S the heatingor sch-aligning in order to odiust fioivjositionwithmespeot -to-thecontact surfaces -on the wee-cartridge.

it be Further-objects myinvention to prowide-such contact clips of ahash! fioating type M which will not subject toanystoess imposed by therigid parts of the device where the clips m-ittaehed'to the'housing. Bymy particular design 'the conductmg'path iorthe electricity isMeepamtclydmmth support of the eonmt-plates. Anlnoidental advantageof'this is tint where -the contact-plates are held in connoting positionby 'a-resillent-member such as a leci's'pi'ingdhe latter-donut a part ofthe elecwoirouit andisntherefore not subject to overtill heatmg on thepassage-oi heavy current. In this my-memes o! the spring is not apt w.'IIL5".-

kraddition, the hnpl'e'ved design of clips permite me'seleethnMmetal lolthe spring ele- U inenta-ota'type notdbund'deskablewheremese (CL241M133) elements must be relied on tocarry eleolmic current ofrelatively high voltage and large amperage. It is well recognized thatsome steels, such as chrome-nickelsteel are admirably adapted 4dr useassprings and are non-magnetic yet have I the drawback of *being ofrelatively high electrical resistance. Hence their use ascurrent-earrying devices is undesirable. By my arrangement, springs ofthis and analogous materialsean be used without introducing resistancein the u electric circuit and without risk of depreciation from loss ofresiliencethroughheating. The electrical path is provided bycurrent-carryingblades of copper or similar metal having low electricalresistance and high thermal conductivity.

"By way of example and -to disclose one form which my invention may takeI have shown the preferred form in the following drawings 'in which,

Fig. l is a. front elevation of the cut-out:

'Fig. 2 is a side view of the same with the cover opened;

Fig. 3 is about elevation with the cover opened;

Fig. i is a longitudinal section on line 4-4111 Fig. 1:

Fig. S-is a lower end view partly in section;

Fig.6 is an enlarged transverse section looking downward on'line '6-6 ofFig. 4;

Fig. 7 is an enlarged transverse section lowing upwardon line I-'I ofFig. 4;

Fig. '8-is an enlarged transverse section on 11m '8 of Fig. 4; and

Fig. '9 is a detail side elevation or a terminpl clip.

The invention is embodied in a box or housing II. This housing is ofweather-proof insulating material and is customarily formed of glazedporcelain of which wet-process porcelain is an example, of the type wellrecognized as capable of withstandingthe relativelyhigh voltage co n- 0men on electrical distribution lines. This housing is of the well knowntype which carriesthe customary metalbar I! on its rear wall for1sttachment to a cross arm, pole or other adequate support. The sidewalls P3, l3 have apertures M, 14 appropriately arranged near-the rearwpll forthe convenient passage of the usual electric cables into thebox. Inside the box these cables endin'terminals of the usual type forattachment to screwthreaded binding posts l6, '5. "The binding posts areheld in the'bases of-the contact clips which will be later describediii-detail.

The upper ends of the walls l3, II are eonnected by an over-hanging topwall M. "The'interior o! the housing is appropriately partitioned Q tosuit the particular needs of this type of device when used withcartridge fuses.

The lower ends of the side walls l3, 13 are spaced to provide an openbottom. The front edges of the walls l3, l3 extend forwardly to form theprojections I1, I! which form holding means or bearings for the hinge ofthe cover.

The cover for the box is a separate piece of porcelain of the same typeas the housing proper and is adapted to fit between the side walls andto be hinged within projections H, H. The cover I8 is adapted to fit inclosing relation over the front faces of the side walls |3, Hi andbeneath the over-hanging front edge of the top 56. The outer face of thecover !8 carries an appropriate rib H) which is formed with an openingproviding a ring handle 24 by which the cover may be swung around itshinge from open to closed position.

Since the cover l8 is made of material such as wet process porcelain, itis quite desirable that special means be provided for supporting it inthe proper position centrally on the hinge memher and for controllingthe movement of the cover so that it will not strike the other parts ofthe housing and become chipped or otherwise damaged.

For this purpose I make use of a special form of frictional bearing. Asshown in Fig. 5 the lower end of the cover l8 has conical recesses 2!.Two aligned openings 22, 22 are provided in the ears l'l, ll of the sidewalls of the housing. These openings 22, 22 provide seats for conicalbushings 23, 23, of thermo-plastic composition, aluminum or similarmaterials. These bushings taper inwardly toward the longitudinal axis ofthe housing and are screw-threaded. A screw 24 connects these bushingsand serves to draw them together when either or both of the bushings arerotated. The bushings are rotated by means of a screw driver or othertool operating on the kerfed bases of the bushings.

The bushings are drawn up sufficiently close by means of the screw 24 toprovide a frictional bearing on the inner walls of the communicatingrecesses 2|, 2|. In this way the bushings can be spaced in the recesses22, 22 so that the cover is held in proper place between the side wallsl3,

l3 but out of contact with them.

The openings 22, 22 beyond the bases of the bushings are filled withcement or other material so as to hold the bushings and the cover in thedesired position. In this way the bushings form a frictional hinge aboutwhich the cover may be swung but retain the cover in its adjustedposition without risk of its falling against the housing and becomingdamaged.

In order to limit the opening movement of the cover two rubber stops 25,are provided on the open base of the housing. In like manner a rubberstop 26 is mounted on the housing beneath the over-hanging top It inorder to help limit the closing movement of the cover as shown in Fig.4.

The fuse is shown in detail in Fig. 4 to consist of a fiber tube 21which contains the fusible wire. The upper ferrule 28 is in the form ofa cap extending over the end of the tube 27 and fitted with an asbestosgasket 28. The cap has a hollow neck 29 which is screw -threaded toreceive the knurled cap cover 38.

The opposite or open end of the ferrule carries screws 3|, 3| passinginto recesses in the side walls of the tube 21.

The cap 29 is generally octagonal as shown in Fig. '7. On opposite sidesof the cap are laterally extending lugs 32, 32 which are used to holdthe cap in definite position with respect to the cover i8. The bottomwall of the cap 28 carries at its front end a pair of spaced parallelfeet 33 which form stops for the cartridge when in its adjustedposition. A holder 34 made of sheet brass is anchored by means of stud35 to the inner wall of cover I8. This holder has opposed side arms 36which are fiared outwardly to form shoulders 31 and inwardly projectingends 38, 3B. The sides of the shoulders 37, 3'l have extension lugs 39,39 shown in Fig. 3 to extend inwardly to the side walls of the ferrule28. In mounting the fuse on the cover I 8 the cap ferrule 28 is placedwith the feet 33, 33 against the base of the holder 34 thus bringing thearms 32, 32 within the shoulders 31, 31. The ferrule 28 is then pushedupward into the holder 34 until the arms 32, 32 are stopped by the lugs39, 39. In this position the ferrule is held against furtherlongitudinal movement by the lugs 39, 39 while the ends 38, 38 preventthe ferrule being pulled away from the cover.

Near the opposite end of the tube 21 there i mounted a ferrule 40. Theupper and lower sides of this ferrule carry the screws 4|, 4| by meansof which the ferrule is locked into position on the tube.

The opposite end of the ferrule has screwthreaded portion 42 ending in atapered end portion 43. A collar 44 is provided to thread on the portion42 and fit against the tapered end portion 43. The collar has a knurledrim 45 at its upper end.

The means for holding the ferrule in place on the cover comprises aholder 46 which is anchored to the cover l8 by means of an embedded stud41. Springs arms 48, 48 forming integral parts of the holder 46 extendinwardly from the cover and fit tightly around the collar 44 beyond therim 45 in the manner shown in Fig. 8.

Both the ferrule 28 and ferrule 40 have opposite side walls 49, 49 whichform bearing surfaces for the electrical conductors or clips mounted onthe back wall of the housing.

In mounting the cartridge on the cover the ferrule 28 is inserted inholder 34 in the manner already described thus bringing the rim 45between the two holders and the collar 44 opposite the holder 46. Thecartridge is then pivoted on the holder 34 thus snapping the collar 44between the spring arms 48, 48. The fuse is prevented from endwisemotion in one direction by the fingers 39, 39 and by the rim 45 comingagainst the spring arms 48, 48 in the other direc tion. The feet 33, 33and side arms 32, 32 hold the cartridge in such position that the sidewalls 49, 49 of the ferrules are maintained in parallel planesperpendicular to the inner wall of the cover.

The circuit connections for operating with the side walls 49 of thecartridge fuse ferrules are in the form of clip assemblies which aremounted against the back wall of the housing and locked into placebetween the side walls |3, I3. I have shown in Fig. 3 the lower circuitassembly denoted generally by the numeral 50 and the upper assembly 5|.These assemblies are shown in enlarged side elevation in Figs. 6 and '7.Each of these assemblies include a terminal bar 52 which has one lateralextension with a transverse wirereceiving groove 53. The bar isscrew-threaded on opposite sides of the groove to receive a series ofbinding screws 54 of which one is on the outer *mdmidlei .md-mmnao dmthe wieldsn! them. sdhthres W the 'rbflbithdteol onrlrim the more inorder to .namdhecendtei theiesd conductor intlnnoove. c Mikonarthusbehmuehtin tbmuzh A H.110! eithersideoulliii, ill. me do! conductor-wemay be held in this mini terminal memtersaloh as money :tnr mm :att some of Q :mmu scroll-id.

"manor flsisin contact with ayoke til. yoke huvnaraiieumstnnding odenombers each of which in an outr-rdb mending ton ue Id. ilhsmresfl are IMin width to about mm oithewidth climate ii. wince tonguel lldom u desto -wolt-dihe contact plates in? which the curo'msis. carried to thedermlee of the dose. The the members it ,and the U es 51 mo nerve itdesired.v lilbtfimcnts Winch he-dm'nflokflianddl ot the (use one! mtltmdimi theinwudniovement at the m. em il-Moll: w; d iniig. 6. M We N we acontact plate to. dl'heeontoc iplote is'senc aii flat with the upp rmascot-outwardly and i r tmh v termed of mm aveiolmis material st l wectrical resistance and highc'opdwtivity. z;; ,s'1he lower and of thankhas lateral lugs 59 M are bent transversely .over the plate to m .a firmcontact withrcurrent carryins WM, Elbe plate 58 is Substantially of thesame my show. The plate is transversely plotted. its said portion abovethe lugs I. to 3min asset t! re m-upon the tongue 51 of the In this .waythe plate" is tree to rock somardlvo $hQf-tll8ll6 a1 and yet be retainedby the latter from displacement.

who 1m ends of the plates II, 58 are con- 49 mind by (a fi tibieconductor extending across month the-terminal bar. This flexible conmaar M is oreierahi termed of cop wires braided and woven into the term 0!a flexible .wa The ends or the conductor al are held M 9 between theplate It and its lugs 59. we mid-portion of the conductor is in extendedcontact with the bottom surface of the terminal that.

Aqeneoally U-ohaped spring 32 extends transwarmly beneath the terminalbar 52 and in conta t withthe web .61. The branches 8!, I3 of the racing82 terminate in inwardly extending hearins memb rsflrtl which have .agenerally spherion contour thus forming a rocking bea ng niainst theouter sidesof .thecontam plates I, It. a ,mic inward movement of thebranches in. It is Y f h contact with the ends of the 1.51, asindicatcflin Fig. 9. When the ferrule of the (use is received between the contactp J8 tlrelattar are spread into parallelism an separate suflicientiy topush the branches 6!, 63 away from the ends of the tongues 51, 51 at thesame time the ball contact between the hearing members 84 and contactplate 5. is such as to permit the latter to rock into extended contactwith the side surface of the ferrule, without loss of pressure and yetwith the minimum area of contact between the bearing members 64 and theplates 58. In this way the electrical path through 70 the branches ofthe spring members 62 is reduced and substantially all the currentcarried through the flexible conductor 8|.

A second U-shaped spring clip 65 is provided beneath the spring 62. Theclip 8! has upstand- 75 ing arms 86, 86 terminating in outwardly bentfingers 61, 81. The fingers are adapted to be aiming into the \oppmitegrooms it. it in the lunar driemls otiihe'housinmushownm Fit. :6.

when tin oiips are thus received within 5 housing the lower learners fitarithin a cushioning piece of sheet insulation 69 held in the dlle oithe housing.

'fiieinrminalibarfl is attached on medic to the yoke and on the oppositeskis toithefl conductor 6d. the spring, and the anring oib iii by meansof :a ri'vet .10 so that the dome may be asseniliod iim' irmrtion intothe mling as a unit.

The were: assembly has :a second lain-a1 5- I tensionioniihetemnnaibaronthe sideolbbe moire opposite horn the extension car-rm :thebinding screws 54. The extension H (Rig. 4) servos a a support tor "ahirly zu-lhapui lock 32, firearms ii iii ymich are bent :inwordi! to Iiomna rib and men outwardly to form flaring flanges 55. This structureis illustrated in detailin Fig. 7 where it is apparent thatthecovor iiiinciomd position brings the holder 34 will its shouldem 31 inside theribs M.

In MI aiming operation of the cover the inwm'dly projecting ends 88 ofthe holder the flaming flames 75 and spread the look to permit theshoulders 31 to pass by the iiiho H. The arms 18 then spring inwardly tohing he I ribs 5 'mimt the side arms 35 at the ladder thus lookingtheoover it! and its nuts in operative position.

It ;s to be understood that during moration'the contact plates 58 havebeen eausedzto' conform to the side walls of the ferrules in in mannerabove described and as illustratm'l in Fig. 6.

In the assembly oi thisidavioemhe car-st. is accurately pmitionodbetween the walls B. M by meanslof the improved hinge so that theholdors or the cartridge tune are opposite the cmiaot'or terminalmembers in the base.

The terminal assemblies are inserted in the base ami locked in place .bymeans .of the '80- gers 61.

The fuse is inserted first in the :upper holler and than in :the lowerholder in .the manner already described so "that it is accuratelypositioned with respect to the cover and the tormim nai members.

After a line conductor has been applied to each of the terminal membersthe operation of cloaing the cover serves to bring the contact plltes I!in extended conducting contact with the side 85 walls 0! the fuseferrules. In this operation the contact plates are held up into properpeeition by the resilience of the springs and with a minimum area ofpressure as is most dairable;

The cut-out is held in closed or operating position by means of thespring lock 12 fitting around holder 34.

The electrical path is primarily through the contact plates 58 and theflexible web ll so that excessive current will not impair the resillenceof the springs 62 or the holding property of the yoke 55.

While I have shown the preferred form of my invention for purposes ofexample, yet it is evident that the features of this invention are notlimited to this form but may be embodied in devices of various forms andproportions within the scope of the appended claims.

What I claim is:

1. In combination, a housing for a cut-out or the like, said housinghaving parallel side walls, a cover for said housing, and acover-centering pivot carried by said walls for holding the cover inpredetermined spaced relation between said side walls.

2. In combination, a housing for a cut-out or the like, said housinghaving parallel side walls, a cover for said housing, and a pivotcarried by said walls and comprising means for axially adjusting andholding the cover in predetermined spaced relation between said walls.

3. In combination, a housing for a cut-out or the like, said housinghaving parallel side walls, a cover for said housing, and a frictionalpivot carried by said walls for holding the cover against free motion.

4. In combination, a housing, a cover hinged thereto, spaced holders onthe inner surface of the cover, one of said holders having retainingmeans, the other holder having a pair of opposed spring arms, a fuse, aferrule on the fuse having means fitting within the retaining means ofthe first mentioned holder to limit the movement of the fuse in onelongitudinal direction, a second ferrule on the fuse having a circularflanged collar engaging the second mentioned holder to prevent movementof the fuse in the opposite longitudinal direction and circuit terminalmembers carried by the housing for engagement with said fuse when thecover is closed.

5. In combination, a housing, a cover hinged thereto, spaced holders onthe inner surface of the cover, one of said holders having retainingmeans, a fuse, a ferrule with opposite plane sides on the fuse, andhaving means fitting within the retaining means of said holder, separatemeans on the ferrule spacing the ferrule from the cover with the planesides perpendicular to the inner surface of the cover, the other holderhaving a pair of opposed spring arms, a second ferrule on the fuseengaging said spring arms, and circuit terminal members carried by thehousing for engagement with the ferrules of the fuse when the cover isclosed.

6. In combination, a housing, a cover hinged thereto, spaced holders onthe inner surface of the cover, a fuse carried by said holders, circuitterminal members anchored in the housing for engagement with said fusewhen the cover is closed, each of said members comprising a supportingyoke, outwardly extending tongues on the yoke, contact plates supportedon said tongues, independent resilient means including partsphericalbearing members in contact with said plates and limited in movement bythe said yoke tongues, and a common conductor for said contact plates.

7. In combination, a housing, a cover hinged thereto, spaced holders onthe inner surface of the cover, a fuse carried by said holders, circuitterminal members anchored in the housing for engagement with said fusewhen the cover is closed, each of said members comprising a supportingyoke outwardly extending tongues on the yoke, contact plates supportedon said tongues, independent resilient means in contact with saidplates, a common conductor for said plates, a terminal bar, means foranchoring the terminal member in the housing and means fastening theyoke, resilient means, conductor and anchoring means to the terminalbar.

8. A terminal member for a circuit cut-out Comprising a terminal bar, ayoke mounted thereon, a contact plate supported loosely on each end ofthe yoke, a common flexible conductor connecting the plates to theterminal bar, and a. U-shaped spring resting on the contact platesbeyond their attachment to the yoke.

9. A terminal member for a circuit cut-out comprising a terminal bar, ayoke mounted thereon, a contact plate supported loosely on each end ofthe yoke, a common flexible conductor connecting the plates to theterminal bar, and a U-shaped spring having part-spherical bearingmembers resting on the contact plates beyond their attachment to theyoke.

10. A terminal member for a circuit cut-out comprising a terminal bar, ayoke mounted thereon, a contact plate supported loosely on each end ofthe yoke, a common flexible conductor connecting the plates to theterminal bar, and a U-shaped spring of relatively lower conductivitythan the plates and conductor, said spring bearing on the plates with aminimum area of contact and beyond the points of their attachment to theyoke.

11. A terminal member for a circuit cut-out comprising a terminal bar, ayoke mounted thereon, a contact plate supported loosely on each end ofthe yoke, a common flexible conductor connecting the plates to theterminal bar, a U- shaped spring bearing on the contact plates, an-

choring means, and a rivet fastening the yoke,

conductor spring and anchoring means to the terminal bar.

12. A terminal member for a circuit cut-out comprising a terminal bar, ayoke mounted thereon, outwardly extending tongues on the ends of theyoke, a contact plate supported loosely on each tongue, a commonflexible conductor connecting the plates to the terminal bar, a U-shaped spring bearing on the contact plates beyond their attachment tothe yoke, the said tongues serving to limit the inward movement of thespring and common means for fastening the yoke, conductor and spring tothe terminal bar.

EDWIN M. MEYER.

